Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 52)

Chapter 3
Hardware Description
40 – 100 HP, 230VAC
75 – 200 HP, 460VAC
3-12
Armature Pulse Transformer and Snubber Board (A2, A3, A4) – The
primary functions of the Armature Pulse Transformer and Snubber Board
(Figure 3.9) include:
•
Isolate power bridge circuitry from control circuitry.
•
Provide dv/dt protection across SCRs.
There are 3 Armature Pulse Transformer and Snubber Boards. Each board
is associated with a single phase of the incoming AC line. The board is
physically mounted on the armature power bridge busbar, with screw
terminals used to mount the board also used as the connections to the
incoming AC line and DC bus.
Figure 3.9
Armature Pulse Transformer and Snubber Board Hardware Location
AB0666A
Armature Pulse
Board
J1
Field Pulse Transformer and Snubber Board (A5) – The primary
functions of the Field Pulse Transformer and Snubber Board (Figure 3.10)
include:
•
Isolate power bridge circuitry from control circuitry
•
Provide dv/dt protection across SCRs.
The board is physically mounted on the field power bridge buswork, with
the screw terminals used to mount the board also being used as the
connections to the incoming AC line and DC bus.